<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script type="text/javascript">
			console.log(100) //
			console.log(0xff)
			console.log(077)
			console.log(3.1415926)
			console.log(3.5e3)
			
			console.log(typeof 100)
			console.log(typeof 3.145)
			
			console.log(1/0)
			console.log(0/0)
			
			console.log("Hello world!")
			console.log('Hello world!')
			console.log("Hello world,\"js\"!")
			console.log('Hello world,"js"!')
			
			console.log(typeof "hello")
			
			console.log(true)
			console.log(false)
			var a = 10;
			var b = 20;
			console.log(a==b)
			
			console.log(typeof (a==b))
			
			var c;
			console.log(c);
			console.log(typeof c)
			
			var d = document.getElementById("div01")
			console.log(d)
			console.log(typeof d)
		</script>
	</body>
</html>
